In combination with the "DynaTemp CR-BS", the thermostats "Uni LHZ" and "Uni FHZ" allow a timed temperature setback with the help of an integrated electrically heated liquid sensor. The operation is identical with that of a standard thermostat. If the thermostat is energized, it switches to temperature setback. The thermostats "Uni LHZ" and "Uni FHZ" can be activated via the control unit DDC "CR-BS" via LAN networks or the internet.